Description: M4 17mm maintenance thumb screw knob for rod clamp rail block DSLR photography. It is spring loaded, and can be pulled out and turned to a more user friendly position after being tightened. Made of aluminum alloy, durable in use. T-shaped Design: Convenient and comfortable adjustment. You will not need spanner with wrench csrew when you fix your device. Specification: Material: Aluminum Alloy Size: Approx. 3.8 × 3cm/1.50 × 1.18inch Package Includes: 1 Piece T-Shaped Handle Screw Note: Please allow a slightly errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understanding and attention
